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//===- MachineBlockFrequencyInfo.h - MBB Frequency Analysis -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Loops should be simplified before this analysis.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
#include "llvm/ADT/Optional.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/BlockFrequency.h"
#include <cstdint>
#include <memory>
namespace llvm {
template <class BlockT> class BlockFrequencyInfoImpl;
class MachineBasicBlock;
class MachineBranchProbabilityInfo;
class MachineFunction;
class MachineLoopInfo;
class raw_ostream;
/// MachineBlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation
/// to estimate machine basic block frequencies.
class MachineBlockFrequencyInfo : public MachineFunctionPass {
using ImplType = BlockFrequencyInfoImpl<MachineBasicBlock>;
std::unique_ptr<ImplType> MBFI;
public:
static char ID;
MachineBlockFrequencyInfo();
~MachineBlockFrequencyInfo() override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &F) override;
/// calculate - compute block frequency info for the given function.
void calculate(const MachineFunction &F,
const MachineBranchProbabilityInfo &MBPI,
const MachineLoopInfo &MLI);
void releaseMemory() override;
/// getblockFreq - Return block frequency. Return 0 if we don't have the
/// information. Please note that initial frequency is equal to 1024. It means
/// that we should not rely on the value itself, but only on the comparison to
/// the other block frequencies. We do this to avoid using of floating points.
///
BlockFrequency getBlockFreq(const MachineBasicBlock *MBB) const;
Optional<uint64_t> getBlockProfileCount(const MachineBasicBlock *MBB) const;
Optional<uint64_t> getProfileCountFromFreq(uint64_t Freq) const;
bool isIrrLoopHeader(const MachineBasicBlock *MBB);
const MachineFunction *getFunction() const;
const MachineBranchProbabilityInfo *getMBPI() const;
void view(const Twine &Name, bool isSimple = true) const;
// Print the block frequency Freq to OS using the current functions entry
// frequency to convert freq into a relative decimal form.
raw_ostream &printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const;
// Convenience method that attempts to look up the frequency associated with
// BB and print it to OS.
raw_ostream &printBlockFreq(raw_ostream &OS,
const MachineBasicBlock *MBB) const;
uint64_t getEntryFreq() const;
};
} // end namespace llvm
#endif // LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
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